. Water Supply and Irrigation Papers of the United States Geological Survey . ove its surface and generally descend abruptly to thewaters edge. Originally these mountains were densely timbered, butduring recent years those to the east of the lake have been almostdenuded of their forests for lumber and fuel. In the channel of Truckee River, about 500 feet back from the lake,is a crib dam of timber and stone (see PI. IV, .4), which for the lasttwenty years or more has been controlled by the Truckee LumberCompany, which has used the lake waters for flushing logs down theriver and for supplying po
. Water Supply and Irrigation Papers of the United States Geological Survey . ove its surface and generally descend abruptly to thewaters edge. Originally these mountains were densely timbered, butduring recent years those to the east of the lake have been almostdenuded of their forests for lumber and fuel. In the channel of Truckee River, about 500 feet back from the lake,is a crib dam of timber and stone (see PI. IV, .4), which for the lasttwenty years or more has been controlled by the Truckee LumberCompany, which has used the lake waters for flushing logs down theriver and for supplying power to its sawmills at Truckee when thenatural flow of the stream is insufficient for those purposes. Forthe last five years the waters have not been employed for flushinglogs, but they are still used for power purposes. The dam has threeopenings, with , , and feet clear width, which are closed 44 WATER STORAGE IN THE TRUCKEE BASIN. [NO. by timber gates. The two wider openings have in the center ver-tical posts 8 inches in width, which have been deducted in the. Fig. 5.—Map of Lake Tahoe. widths of the openings given. The dam has a waste way of 72 feetclear length and (3 feet above the floor of the gates. taylor.] LAKE TAHOE. 45 The following data regarding the fluctuations in the lakes surfaceare taken from the Eleventh Annual Report of the United StatesGeological Survey, Part II. On July 19, 1889, the elevation of thelake surface was taken at 0,225 feet. As subsequently found, thewater afterwards fell during that summer about feet, reachingextreme low water in the autumn. At the time of the survey, July19, the wasteway crest was feet above the water surface of thelake. As afterwards ascertained by Mr. William Ham. Hall, supervis-ing engineer of the United States Irrigation Survey, the lowest knownwater plane of the lake was in October, 1889, when, as already stated,the surface was about feet lower than at the time of the highest observed
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